Knowing what I know now - As, an ab initio pilot (student), I would be very leery about a flight school/Instructor, who sought to abdicate their to keep me safe at all times, within the context of flight training (As I understand it the risks for a pilot at this stage are very low.
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Would you not agree that when the instructor deems you competent to solo and gets out of the aircraft he is shifting the responsibility of your safety to you because as the only person in the AC you become pic. An instructor can only do so much from the ground with a handheld. It is up to you to complete the flight in safe manner.